Nickel flash furnace side blowing reduction device

Abstract

The utility model discloses a nickel flash furnace side-blowing reduction device which comprises two groups of gas flow control systems which are connected in parallel, and the tail end of each group of gas flow control system is connected with a mixed gas pressure control system; the gas flow control system comprises at least two gas branches, and each gas branch is sequentially provided with a stop valve, a gas filter, a pressure reducing valve, a flow controller and a first check valve in the gas flowing direction. The mixed gas pressure control system comprises a static mixer, a gas pressure gauge, a pressure regulating valve and a second check valve which are sequentially arranged in the gas flowing direction. Through the gas flow control system and the mixed gas pressure control system, the flow and pressure of gas entering the side-blowing reduction spray gun can be accurately controlled, the stirring effect of the side-blowing reduction spray gun is guaranteed, the reduction efficiency of slag is improved, and the situation that the spray gun is burnt out when a single gas medium cannot be supplied and breaks down can be prevented. And the service life of the side-blowing reduction spray gun is prolonged.

Description

Technical Field

[0001] The utility model relates to a side-blowing reduction process in the field of nonferrous metallurgy, in particular to a side-blowing reduction device for a nickel flash furnace. Background Art

[0002] The nickel flash smelting process is a strong oxidation suspension smelting process. The product low-nickel matte is discharged from the front of the furnace, and the slag is stored in the slag yard after water quenching. In recent years, due to the continuous increase of MgO in the raw materials, the viscosity of the slag has increased, the sticky slag layer has increased, and the clarification and separation of the slag copper in the depleted area has not been thorough, resulting in an increase in the loss of nickel in the slag in the form of mechanical inclusions, and the nickel content of the tailings is high, which makes the nickel direct recovery rate of the flash furnace system low. At present, the reducing agent added to the nickel flash furnace during operation is mainly lump coal. The main problem is that after the lump coal is added, it floats on the surface of the molten pool and only contacts with the surface of the slag, and cannot fully contact and react with the slag. The reduction effect is limited and the utilization rate is low, which affects the comprehensive recovery of valuable metals in the slag. In order to reduce the abandoned slag index of the flash furnace, the natural gas reducing gas is forced to be blown into the slag layer to enhance the reducing atmosphere in the furnace to reduce the magnetic iron in the slag, reduce the viscosity of the slag, and improve the comprehensive recovery rate of valuable metals. On the other hand, the side blowing of natural gas increases the agitation of the molten pool, accelerates the mass transfer and heat transfer rate between the melts, and enhances the reaction kinetic conditions in the furnace. Utility Model Content

[0003] The utility model aims to provide a nickel flash furnace side-blowing reduction device, which can accurately adjust the concentration and pressure of the side-blowing reduction gas and improve the side-blowing reduction effect.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A nickel flash furnace side-blowing reduction device comprises two sets of gas flow control systems connected in parallel, each set of gas flow control systems is connected to a mixed gas pressure control system at the end; the gas flow control system comprises at least two gas branches, each gas branch is provided with a stop valve, a gas filter, a pressure reducing valve, a flow controller and a first check valve in sequence along the gas flow direction; the mixed gas pressure control system comprises a static mixer, a gas pressure gauge, a pressure regulating valve and a second check valve in sequence along the gas flow direction;

[0006] It also includes a PLC control system, which is respectively connected to the pressure reducing valve, the flow controller, the gas pressure gauge and the pressure regulating valve by signals.

[0007] Compared with the prior art, the utility model has the following beneficial effects:

[0008] Through the gas flow control system, mixed gas pressure control system and PLC control system, the gas flow and pressure entering the side-blowing reduction spray gun can be remotely and accurately controlled, which not only ensures the stirring effect of the side-blowing reduction spray gun and improves the reduction efficiency of the slag, but also prevents the spray gun from burning when a single gas medium cannot be supplied and a malfunction occurs, thereby extending the service life of the side-blowing reduction spray gun. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic diagram of the system structure of the utility model.

[0010] In the figure, 1-stop valve, 2-gas filter, 3-pressure reducing valve, 4-flow controller, 5-first check valve, 6-static mixer, 7-gas pressure gauge, 8-pressure regulating valve, 9-second check valve. DETAILED DESCRIPTION

[0011] The present invention will be further explained below in conjunction with specific implementation methods.

[0012] like Figure 1 As shown, a nickel flash furnace side-blowing reduction device includes two sets of parallel gas flow control systems, and the end of each set of gas flow control systems is connected to a mixed gas pressure control system; the gas flow control system includes two gas branches (nitrogen and natural gas or oxygen and compressed air are respectively introduced), and each gas branch is provided with a stop valve 1, a gas filter 2, a pressure reducing valve 3, a flow controller 4 and a first check valve 5 in sequence along the gas flow direction; the mixed gas pressure control system includes a static mixer 6, a gas pressure gauge 7, a pressure regulating valve 8 and a second check valve 9 arranged in sequence along the gas flow direction; and also includes a PLC control system, which is respectively connected to the pressure reducing valve 3, the flow controller 4, the gas pressure gauge 7 and the pressure regulating valve 8 by signal.

[0013] When the above device is in use, two groups of gas flow control systems output nitrogen, natural gas, oxygen and compressed air of specific flow rates respectively, and then enter the mixed gas pressure control system two by two for gas mixing, and finally output oxygen-enriched air and nitrogen-mixed natural gas of specific concentration and pressure. The nitrogen-mixed natural gas is connected to one joint of the side-blowing reduction spray gun, and the oxygen-enriched air is connected to the other joint of the side-blowing reduction spray gun. The two gases enter the nickel flash furnace through the side-blowing reduction spray gun, stir the slag, and undergo an interactive reduction reaction with it, thereby reducing the valuable metals in the slag and improving the recovery rate of the valuable metals.

[0014] The PLC control system can not only adjust the inlet pressure and outlet flow rate on each gas branch of the gas flow control system, but also adjust the mixed gas pressure entering the mixed gas pressure control system, ensuring that the pressure and concentration of the oxygen-enriched air and nitrogen-mixed natural gas that finally enter the side-blowing reduction spray gun meet the process requirements, avoiding unnecessary burning of the side-blowing reduction spray gun and maximizing the reaction efficiency in the nickel flash furnace.

[0015] In addition, when the flash furnace conditions fluctuate, the gas pressure and flow rate can be adjusted remotely and promptly through the PLC control system to ensure that the recovery rate of valuable metals remains stable.

[0016] Finally, it should be noted that the specific application of the utility model is not limited to nickel flash furnaces, but also has reference significance for other metallurgical furnaces.

Claims

1. A nickel flash furnace side-blowing reduction device, characterized in that: The invention comprises two sets of gas flow control systems connected in parallel, each set of gas flow control systems is connected to a mixed gas pressure control system at the end thereof; the gas flow control system comprises at least two gas branches, each gas branch is provided with a stop valve (1), a gas filter (2), a pressure reducing valve (3), a flow controller (4) and a first check valve (5) in sequence along the gas flow direction; the mixed gas pressure control system comprises a static mixer (6), a gas pressure gauge (7), a pressure regulating valve (8) and a second check valve (9) in sequence along the gas flow direction; It also includes a PLC control system, wherein the PLC control system is respectively connected to the pressure reducing valve (3), the flow controller (4), the gas pressure gauge (7) and the pressure regulating valve (8) by signals.

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